Jump-spark timer.



c. H. ASHMEAD, JR.

l-UMP SPARK TIMER. :APPLICATION FILED FEB-16,1915.

1 180,688 Patented Apr. 25, 1916'.

11mm kw,

q Vihwoom CLARENCE H. ASHMEAD, JR, F FORT 'LAUDERDALE, FLORIDA.

JUMP-SPARK TIMER.

' Specification of Letters Patent.

Patented Apr. 25, 1916.

' Application filed February 16. 1915. Serial No. 8,483.

To all whom it may concern:

Be it known that I, CLARENCE H. Aer;- Iceland in, a citizen of the United States, residing at Fort Lauderdale, in the county of Dade and State of Florida, have invented certain new and useful Improvements in Jump-Spark Timers, of which the following is a specification.

My invention relates to jump-spark timers for internal combustion engines wherein friction between the contacting parts and wear thereof is reduced to a minimum.

Further, it is an object of the invention to provide one of the two contacting elec trodes rotatable and the other electrode as yieldingly slidable to accomplish the aim. set forth. Also, the invention aims to provide a novel construction of supporting and housing means for the electrodes as illustrated in accompanying drawings and hereinafter described.

In said drawings: Figure 1 is a front elevation of the timer with the face plate re moved; Fig. 2 is a rear elevation of the timer; Fig. 3 is a cross section on the line 33 of Fig. 1, and Fig. 1 isa detail sectional view taken through the slidabie electrode and supporting rotor and at a right angle to Fig. 3. p

Referring specifically to the drawings A generally represents one of the im-- proved timers.' It is clear that any de sired number of timers may be employed in connection with an internal combustion engine, depending upon the number of its cylinders. The timer has a rotary shaft 1 which removably extends into a short hollow shaft2 of a rotor having a head 3 of greater diameter than the collar. 4 A sta-,

tionary casing 4 has a collar 5 in which the hollow shaft 2 is journaled and has a receptacle 6 in Which head 3 is disposed and which receptacle has an annular inclosing wall 7. A plate 8 may extend across the open face of the receptacle and be secured as by screws 9 to'the wall 7. The rotor 2,-3 rotates with shaft 1 and to this end a collar or ring '10 is mounted on shaft 2 and through the ring and shaft 2, one or more set screws 11 pass'to fasten the shaft 1 and rotor rigidly together. Ring abuts the movement of the rotor.

On the head 3 is formed integrally a box 12 open atone'end and closed at the other end of collar 5 to prevent undue inward 'end'by a wall 13. lSlidably mounted within the box is an electrode 14 against the inner end of which and thewall13, an expansion.

spring 15 bears, serving to project the electrode beyond the open end of box 12. An elongated slot 16 is provided in the electrode and through the same passes a retaining pin in the form of a set screw 17 removabiy screwed into the box 12.

Electrode 14: wipes a rotatable roller or electrode 12 Within receptacle 6' loosely mounted on a stud shaft 19 screwed by a shank 20 through the casing 4. A nut 21 engages the shank 2O interiorly of-the casing and nuts 22 engage the shank exteriorly of the casing and clamp between them a conductor wire 23. A hearing 2% for stud 19 may be mountedon plate 8. It will be noted that plate 8 prevents longitudinal displaccment of the roller electrode 18.

Electrodes 14 and 18 are properly c0n-- nested in an electric circuit to cause the pro duction of a jump spark through Wiping-- Shaft 1 may In operation, the rotor and electrode 14 rotate with, shaft 1 and during rotation the electrode'wipes electrode 18, slides inwardly against the tension of spring 15 and causes electrode 18 to rotate, thus ihsuring'eiiective contact of the electrodes to close the circuit through the spark plug to provide the jump sparlnand at the same time effect such contact practically without friction and wear of the parts. Y

As merely the preferred embodiment of the invention has been illustrated and-dc scribed, changes Within. the spirit and scope may be resorted to. I

I claim: I 1. A timer having a casing, a rotor there in having a box member overlapping the casing to prevent displacement of the rotor through movement in one direction, an elec f/lfOde member slidable. in saidbox memh one of said members being provided with an elongated slot, the other of said members he ing provided with a pin entering said slot,

- and means? to urge said electrode outwardly.

Y prevent movement of the rotor in the-direc-,

2. A timeiahaving a casing, a rotor therein having a box member and a shaft, -said box member overlapping the casing to prevent displacement of the rotor, through movement in one direction, a power shaft, an abutment member separate from the eas- .ing and engaging the same and a fastening member extending through the abutment member and cooperating with said shaft to tion opposite to the said direction, electrode means mounted on the casing and electrode means cotipe'rating' with said electrode means carried by the box.

3. A timer having a casing, a rotor within said casing, an electrode carried by said rotor, said rotor abutting the casing to prevent movement of the rotor in one direction,

a shaft, and means common for the purposes of fastening said rotor to said shaft and preventing movement .of the rotor in the direction opposite to that previously specified.

4. A timer having a-casing, an electrode within said casing, a rotor having a head abutting the casing, a box on said head, an

electrode to engage said electrode movably mounted in said box, a shaft on said rotor,

'21 second shaft, means mounted on the first shaft abutting the casing and fastening means to secure the shafts in rigid relation passing through said-means.

5. A timer having a casing, provided with a receptacle and a collar and a closure plate, a stud in said casing, an electrode rotatably mounted on said stud and mounted against displacement by said plate, a rotor having a shaft mounted in said collar and having a CLARENCE H. ASHMEAD, JR.

Witnesses:

H. V. CALDER, M. A. MARSHALL.

copies at this patent may be 'obhineg tor five cents each, by addressing the Gommissioner of Patents.

Washington, D. 0. 

